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1, 1, 4, 11, 42, 132, 520, 1761, 6970, 24604, 97740, 353886, 1408456, 5186830, 20673334, 77060191, 307402490, 1156225566, 4615394884, 17481280422, 69812708258, 265891539128, 1062228300604, 4063922007022, 16239378774724, 62361864245180, 249247207795482, 960167359575770, 3838172631009646
(列表;图表;参考;听;历史;文本;内部格式)
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